Your O.S. .46AX is an easy starting, reliable running engine and a real powerhouse when broken in. It is necessary to start from in front of the engine. So, the plane should be held in position. I do this with a screw driver, driven into the ground in back of the plane and a loop of small rope looped around the tailfeathers and back to the screwdriver. (Remember to remove the screw driver after your done so someone wont trip over it). Or, someone can hold the tail of the plane, or many clubs have starting tables which hold the plane. Once started, it' is safest to move to the back of the plane and remove the glow plug heater and adjust the engine from behind. Your best information on running, care and breaking in of your engine is contained in the engine's instruction booklet. When the Cowboys show up telling you how to do something with your engine, only heed the information they give, which parrots the instructions in the engine booklet! You will hear amazingly stupid opinions on how to adjust the needle valve and break in an engine. DO NOT HEAD!!